{
  "name": "TAGE_FB",
  "label": "Age at first birth",
  "predicateType": "int",
  "group": "N/A",
  "limit": 0,
  "values": {
    "item": {
      "-999": "NA-Missing"
    },
    "range": [
      {
        "min": "12",
        "max": "69",
        "description": "Age"
      }
    ]
  }
}